- Add SyncedFile message and subdir scoping to RescanOrigin proto
- Add label, album_type, cover_url fields to UpdateMetadataRequest/MetadataResponse
- Implement OriginScanner: walk, hash, diff, ingest with live FUSE tree and content fetcher registration
- Add enrichment DB columns: enrichment_source, enriched_at, enrichment_attempts, genres_json, label, album_type, cover_url
- Add EnrichmentUpdate struct and update_enrichment DB method
- Wire BatchUpdateMetadata to write enrichment fields alongside audio metadata
- Wire gRPC server into CLI mount command with --grpc-port flag
- Pass VirtualTree and ContentFetcher to scanner so rescanned files are immediately visible and readable via FUSE
- Update upsert_file() to include all 26 new AudioMeta fields
- Update get_file_by_virtual_path() to read all new columns
- Add get_file_metadata_row() for overlay synthesis
- Add update_metadata() for partial metadata updates
- Add clear_overlay() to reset metadata to NULL
- Handle format_layout BLOB with msgpack serialization
- Handle custom_tags JSON with serde_json
- Add 8 comprehensive unit tests
- All 92 tests pass, LSP diagnostics clean
- Implement all 8 FormatHandler trait methods
- Use lofty 0.24 for ID3v2.4 tag creation/parsing
- Map all 36 AudioMeta fields to ID3v2 frames
- Handle ID3v2 header parsing for audio_start
- Detect ID3v1 tags at EOF for audio_end
- Add 13 comprehensive unit tests
- Fix test-utils AudioMeta construction with ..Default::default()
- All tests pass, LSP diagnostics clean
Alexander